Breast MRI Showed Mass. AMAS Cancer Blood Test Showed Negative. How To Diagnose Breast Cancer?
Pathology is the single most important investigation for diagnosing breast cancer and can be considered as the "gold standard" against which all other tests can be compared especially radiological ones. In your case, you seem to have a positive pathological diagnosis of breast cancer, which should be taken very seriously.
I am not too confident about MRI depicting benign characteristics of a tumor as a malignant mass in its early stage can mimic a benign one. Also, the AMAS blood test which screens for anti-malignin antibody cannot be considered as an extremely accurate test with 100% sensitivity and specificity. Therefore, based on the pathological report I would label you as having breast cancer.
If you have doubts then the best thing would be a repeat core needle biopsy to note the pathological characteristics of the tumor. This is an extremely good test. An even better one would be an excision biopsy of the mass, which would remove the mass in its entirety and outline the pathology best.
Therefore, the pathological diagnosis stands true in your case and I would not give too much importance to a negative diagnosis by the MRI and AMAS tests.
Please let me know if you have further queries.
Wish you all the very best!
Dr. Adhikari